Ben Pruchnie/Getty Images(BRUSSELS) — An explosion at a train station in Brussels, Belgium, on Tuesday that prompted the station to be evacuated but left no victims injured, is considered a terrorist attack, according to the Belgian federal prosecutor’s office.

One suspect was shot by the military after the explosion at Brussels Central Station, a senior Belgian law enforcement official told ABC News. Belgian Federal Prosecutor Eric Van Der Sypt said it is unclear if the suspect is dead or alive.

No one else was injured, he added.

Police said the situation is “under control.”

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Van Der Sypt said the identity of the suspect is not known.

Belgian officials told ABC News that authorities are investigating whether the suspect had an explosive device or devices, potentially a suicide vest or a bag or suitcase.

One eyewitness told Belgian TV that he heard screaming and saw flames.

Eyewitness Arash Aazami told ABC News he heard two explosions and gunfire. He was sheltering inside a restaurant as he told ABC News there was a heavy presence of military, ambulances and police.

The nature of the device was not immediately clear but the bomb squad was called in for fear of additional explosives in the area.